2657421 has 32 divisors (see below), whose sum is σ = 4341120. Its totient is φ = 1596672.

The previous prime is 2657407. The next prime is 2657429. The reversal of 2657421 is 1247562.

2657421 is a `hidden beast` number, since 2 + 657 + 4 + 2 + 1 = 666.

It is not a de Polignac number, because 2657421 - 2⁷ = 2657293 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2657429) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23461 + ... + 23573.

It is an arithmetic number, because the mean of its divisors is an integer number (135660).

2^2657421 is an apocalyptic number.

It is an amenable number.

2657421 is a deficient number, since it is larger than the sum of its proper divisors (1683699).

2657421 is a wasteful number, since it uses less digits than its factorization.

2657421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202 (or 196 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 2657421 is about 1630.1598081170. The cubic root of 2657421 is about 138.5118046128.

The spelling of 2657421 in words is "two million, six hundred fifty-seven thousand, four hundred twenty-one".